Chandogya Upanishad
Prapathaka IV, Khanda 4
Satyakâma, the son of Gabâlâ, addressed his mother and said: 'I wish to become a Brahmakârin (religious student), mother. Of what family am I?'
She said to him: 'I do not know, my child, of what family thou art. In my youth when I had to move about much as a servant (waiting on the guests in my father's house), I conceived thee. I do not know of what family thou art. I am Gabâlâ by name, thou art Satyakâma (Philalethes). Say that thou art Satyakâma Gâbâlâ.'
He going to Gautama Hâridrumata said to him, 'I wish to become a Brahmakârin with you, Sir. May I come to you, Sir?'
He said to him: 'Of what family are you, my friend?' He replied: 'I do not know, Sir, of what family I am. I asked my mother, and she answered: "In my youth when I had to move about much as a servant, I conceived thee. I do not know of what family thou art. I am Gabâlâ by name, thou art Satyakâma," I am therefore Satyakâma Gâbâlâ, Sir.'
He said to him: 'No one but a true Brâhmana would thus speak out. Go and fetch fuel, friend, I shall initiate you. You have not swerved from the truth.' Having initiated him, he chose four hundred lean and weak cows, and said: 'Tend these, friend.' He drove them out and said to himself, 'I shall not return unless I bring back a thousand.' He dwelt a number of years (in the forest), and when the cows had become a thousand,